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Investigating the suitability of flyash/metakaolin-based geopolymers reinforced with South African alien invasive wood and sugarcane bagasse residues for use in outdoor conditions
Stellenbosch University, South Africa.
Stellenbosch University, South Africa . (GoFP)ORCID iD: 0000-0002-8790-8964
Stellenbosch University, South Africa.
Stellenbosch University, South Africa.
2021 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 79, p. 611-627Article in journal (Refereed) Published
Sustainable development
SDG 9: Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation, SDG 12: Ensure sustainable consumption and production patterns
Abstract [en]

The prevailing approach of total clearing to contain the spread of invasive plants (IP) in South Africa is generating enormouslignocellulosic wastes. This study examined the possibility of utilizing these wastes in the production of geopolymercomposites for use in outdoor environments. Untreated wood particles from Acacia mearnsii and A. longifolia, as well assugarcane bagasse residues, were incorporated into a geopolymer matrix developed from a binary precursor system of 75%fly ash and 25% metakaolin. The variables considered included precursor-activator ratio (PA), curing pattern (CP), lignocellulosicmaterial (LM), and alkali concentration (Mcon). The production process was established using a mixed factorialexperimental design. PA and CP were considered at 2 levels, while LM and MCon were considered at 3 levels. The densityof the boards exceeded 1 g cm−3 and are classified as high-density boards. The boards have comparable sorption propertiesto the cement-bonded particleboard according to the EN 632-2: 2007 standard. However, only A. longifolia boards producedwith 12 M NaOH and PA ratio of 2:1 met the mechanical strength requirements. Thermogravimetric analysis revealed thatthe boards are thermally stable. These results have shown that South African woody IPs are suitable for geopolymer woodcomposites, but there is still concern about their durability in the alkaline matrix. Scanning electron microscopy micrographsindicated mineralization of the particles and a partial degradation of hemicellulose was confirmed by Fourier transform infraredspectroscopy. Although the degraded components did not prevent geopolymer setting, there is need to further investigatethe extent and means of preventing degradation as this can derail the intended use of the product.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 79, p. 611-627
Keywords [en]
Composites; Geopolymer; Waste valorization;
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-100946DOI: 10.1007/s00107-020-01636-4ISI: 000604492600004Scopus ID: 2-s2.0-85098629360OAI: oai:DiVA.org:lnu-100946DiVA, id: diva2:1525811
Available from: 2021-02-04 Created: 2021-02-04 Last updated: 2024-09-03Bibliographically approved

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Amiandamhen, Stephen

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